JP6724028B2 - Narrowband management for machine type communication - Google Patents

Description

Cross-reference of related applications

[0001] This application is US Provisional Application No. 62/120,861 filed February 25, 2015, assigned to the assignee of this application and expressly incorporated herein by reference in its entirety. Claims priority of US patent application Ser. No. 15/052,471, filed February 24, 2016, which claims the priority and benefits of US Pat.

[0002] Certain aspects of the present disclosure relate generally to wireless communication, and more particularly to limited communication resources such as machine type communication (MTC) devices and enhanced MTC (eMTC: evolved MTC) devices. It relates to managing a narrowband region in a system utilizing a device with.

[0003] Wireless communication systems are widely deployed to provide various types of communication content such as voice, data, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing available system resources (eg, bandwidth and transmit power). Examples of such multiple access systems are Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Long Term Evolution (LTE®): Long Term. There is a 3rd Generation Partnership Project (3GPP®) LTE system including Evolution) Advanced and an Orthogonal Frequency Division Multiple Access (OFDMA) system.

[0004] Generally, a wireless multiple-access communication system can simultaneously support communication for multiple wireless terminals. Each terminal communicates with one or more base stations via transmissions on the forward and reverse links. The forward link (or downlink) refers to the communication link from base stations to terminals, and the reverse link (or uplink) refers to the communication link from terminals to base stations. This communication link may be established via a single input single output, multiple input single output or multiple input multiple output (MIMO) system.

[0005] A wireless communication network may include a number of base stations that can support communication for a number of wireless devices. A wireless device may include user equipment (UE). Some UEs may be considered machine type communication (MTC) UEs, which may include remote devices that may communicate with a base station, another remote device, or some other entity. MTC may refer to a communication involving at least one remote device on at least one end of the communication and is a form of data communication involving one or more entities that does not necessarily require human interaction. Can be included. MTC UEs may include, for example, UEs capable of MTC communication with MTC servers and/or other MTC devices via a Public Land Mobile Network (PLMN).

[0006] The systems, methods, and devices of the disclosure each have several aspects, no single one of which is solely responsible for the desirable attributes of the disclosure. Without limiting the scope of this disclosure, which is represented by the following claims, some features are briefly described. In view of this description, and especially in the reading of the section entitled "Detailed Description," how the features of this disclosure provide advantages, including improved communication between access points and stations in a wireless network. Will be understood.

[0007] Certain aspects of the present disclosure provide a method for wireless communication by a base station (BS). The method generally determines a set of DL narrowband regions partitioned from downlink (DL) system bandwidth and a set of UL narrowband regions partitioned from uplink (UL) system bandwidth. And determining a mapping between a set of DL narrowband regions and a set of UL narrowband regions, and using at least one of the mapped narrowband regions at least a user equipment (UE) Communicating with.

[0008] Certain aspects of the present disclosure provide an apparatus for wireless communication by a base station (BS). The apparatus generally determines a set of DL narrowband regions partitioned from downlink (DL) system bandwidth and a set of UL narrowband regions partitioned from uplink (UL) system bandwidth. And determining a mapping between the set of DL narrowband regions and the set of UL narrowband regions, and using at least one of the mapped narrowband regions at least a user equipment (UE) And at least one processor configured to communicate with, and a memory coupled to the at least one processor.

[0009] Certain aspects of the present disclosure provide an apparatus for wireless communication by a base station (BS). The apparatus is generally a means for determining a set of DL narrowband regions partitioned from downlink (DL) system bandwidth and a set of UL narrowband regions partitioned from uplink (UL) system bandwidth. And at least one of the mapped narrowband region and the means for determining a mapping between the set of DL narrowband regions and the set of UL narrowband regions, Means for communicating with at least user equipment (UE).

[0010] Certain aspects of the present disclosure provide a computer-readable medium for wireless communication by a base station (BS). The computer-readable medium generally comprises code for determining a set of DL narrowband regions partitioned from downlink (DL) system bandwidth and UL narrowband regions partitioned from uplink (UL) system bandwidth. And at least one of a code for determining a mapping between a set of DL narrowband regions and a set of UL narrowband regions, and at least one of the mapped narrowband regions. And at least code for communicating with user equipment (UE).

[0011] Certain aspects of the present disclosure provide a method for wireless communication by a BS. The method generally comprises determining a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions being one or more DL narrowband regions for communicating with a UE and one or Identifying one or more DL narrowband regions or a set of resources unavailable to a UE in at least one of the one or more UL narrowband regions comprising a plurality of UL narrowband regions. And providing the UE with an indication of the identified set of resources and communicating with the UE using a narrowband region.

[0012] Certain aspects of the present disclosure provide an apparatus for wireless communication by a BS. The apparatus is generally for determining a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions being one or more DL narrowband regions for communicating with a UE and one or Identifying a set of resources unavailable to a UE in at least one of one or more DL narrowband regions or one or more UL narrowband regions comprising a plurality of UL narrowband regions. And at least one processor configured to provide an indication of the identified set of resources to the UE and to communicate with the UE using a narrowband region, and coupled to the at least one processor. And memory.

[0013] Certain aspects of the present disclosure provide an apparatus for wireless communication by a BS. The apparatus generally comprises means for determining a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions and one or more DL narrowband regions for communicating with a UE. A set of resources not available to the UE in one or more DL narrow band regions or in at least one of the one or more UL narrow band regions comprising one or more UL narrow band regions Means for providing an indication of the identified set of resources to the UE, and means for communicating with the UE using the narrowband region.

[0014] Certain aspects of the present disclosure provide a computer-readable medium for wireless communication by a BS. The computer-readable medium generally comprises a code for determining a plurality of narrowband regions partitioned from the system bandwidth and one or more DL narrowband regions for the plurality of narrowband regions to communicate with a UE. And one or more UL narrowband regions, one or more DL narrowband regions or a set of resources unavailable to the UE in at least one of the one or more UL narrowband regions. For identifying the UE, a code for providing the UE with an indication of the identified set of resources, and a code for communicating with the UE using the narrowband region.

[0015] Certain aspects of the present disclosure provide a method for wireless communication by a BS. The method generally comprises determining a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions being one or more DL narrowband regions for communicating with a UE and one or Determining resources for transmission of a sounding reference signal (SRS) by the UE in at least one of the one or more UL narrowband regions comprising a plurality of UL narrowband regions. And communicating with the UE using the narrowband region, where communicating comprises receiving an SRS on the determined resource.

[0016] Certain aspects of the present disclosure provide an apparatus for wireless communication by a BS. The apparatus is generally for determining a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions being one or more DL narrowband regions for communicating with a UE and one or Determining a resource for transmission of a sounding reference signal (SRS) by a UE in at least one of the one or more UL narrowband regions, the narrowband regions comprising: At least one processor configured to perform communicating with the UE using the region, wherein communicating comprises receiving an SRS on the determined resource; and at least one A memory coupled to the processor.

[0017] Certain aspects of the present disclosure provide an apparatus for wireless communication by a BS. The apparatus generally comprises means for determining a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions and one or more DL narrowband regions for communicating with a UE. Means for determining resources for transmission of a Sounding Reference Signal (SRS) by a UE in at least one of the one or more UL narrowband regions, comprising one or more UL narrowband regions. And means for communicating with the UE using the narrowband region, where communicating comprises receiving an SRS on the determined resource.

[0018] Certain aspects of the present disclosure provide a computer-readable medium for wireless communication by a BS. The computer-readable medium generally comprises a code for determining a plurality of narrowband regions partitioned from the system bandwidth and one or more DL narrowband regions for the plurality of narrowband regions to communicate with a UE. And at least one of the UL narrowband regions comprising one or more UL narrowband regions, for determining a resource for transmission of a Sounding Reference Signal (SRS) by the UE. And a code for communicating with a UE using a narrow band region, where communicating comprises receiving an SRS on a determined resource.

[0019] Certain aspects of the present disclosure provide a method for wireless communication by a UE. The method generally determines a set of DL narrowband regions partitioned from the DL system bandwidth, determining a set of UL narrowband regions partitioned from the UL system bandwidth, and a DL narrowband region , And a set of UL narrowband regions, and communicating with the BS using at least one of the mapped narrowband regions.

[0020] Certain aspects of the present disclosure provide an apparatus for wireless communication by a UE. The apparatus generally determines a set of DL narrowband regions partitioned from the DL system bandwidth, determines a set of UL narrowband regions partitioned from the UL system bandwidth, and a DL narrowband region. At least configured to communicate with a BS using at least one of the mapped narrowband regions and at least one of the mapped narrowband regions. Included is one processor and memory coupled to at least one processor.

[0021] Certain aspects of the present disclosure provide an apparatus for wireless communication by a UE. The apparatus generally comprises means for determining a set of DL narrowband regions partitioned from the DL system bandwidth, and means for determining a set of UL narrowband regions partitioned from the UL system bandwidth, Means for determining a mapping between a set of DL narrowband regions and a set of UL narrowband regions, and means for communicating with a BS using at least one of the mapped narrowband regions including.

[0022] Certain aspects of the present disclosure provide a computer-readable medium for wireless communication by a UE. The computer readable medium is generally code for determining a set of DL narrowband regions partitioned from DL system bandwidth, and code for determining a set of UL narrowband regions partitioned from UL system bandwidth. And a code for determining a mapping between a set of DL narrowband regions and a set of UL narrowband regions, and for communicating with a BS using at least one of the mapped narrowband regions. Including code and.

[0023] Certain aspects of the present disclosure provide a method for wireless communication by a UE. The method generally determines a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions being one or more DL narrowband regions for communicating with a BS, and/or one or more DL narrowband regions for communicating with a BS. A plurality of UL narrowband regions, from the BS, one or more DL narrowband regions or a set of resources unavailable to the UE in at least one of the one or more UL narrowband regions. Receiving an indication, identifying a set of resources based on the received indication, and communicating with the BS using the narrowband region.

[0024] Certain aspects of the present disclosure provide an apparatus for wireless communication by a UE. The apparatus generally determines a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions and one or more DL narrowband regions for communicating with a BS. A plurality of UL narrowband regions, from the BS, one or more DL narrowband regions or a set of resources unavailable to the UE in at least one of the one or more UL narrowband regions. At least one processor configured to receive an indication, identify a set of resources based on the received indication, and communicate with the BS using a narrowband region; A memory coupled to one processor.

[0025] Certain aspects of the present disclosure provide an apparatus for wireless communication by a UE. The apparatus generally comprises means for determining a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions and one or more DL narrowband regions for communicating with a BS. Of one or more DL narrowband regions or of resources unavailable to the UE in at least one of the one or more UL narrowband regions, comprising one or more UL narrowband regions. Includes means for receiving a set indication, means for identifying a set of resources based on the received indication, and means for communicating with a BS using a narrowband region.

[0026] Certain aspects of the present disclosure provide a computer-readable medium for wireless communication by a UE. The computer-readable medium generally comprises code for determining a plurality of narrowband regions partitioned from the system bandwidth and one or more DL narrowband regions for the plurality of narrowband regions to communicate with a BS. And one or more UL narrowband regions, unavailable from the BS to the UE in at least one of the one or more DL narrowband regions or the one or more UL narrowband regions. A code for receiving an indication of the set of resources, a code for identifying the set of resources based on the received indication, and a code for communicating with the BS using the narrowband region.

[0027] Certain aspects of the present disclosure provide a method for wireless communication by a UE. The method generally determines a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions and one or more DL narrowband regions for communicating with a BS. Determining the resources for the transmission of the SRS in at least one of the one or more UL narrowband regions comprising a plurality of UL narrowband regions, and using the narrowband regions with the BS. Communicating, where communicating comprises comprising sending an SRS on the determined resource.

[0028] Certain aspects of the present disclosure provide an apparatus for wireless communication by a UE. The apparatus generally determines a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions and one or more DL narrowband regions for communicating with a BS. Determining the resources for the transmission of the SRS in at least one of the one or more UL narrowband regions comprising a plurality of UL narrowband regions, and using the narrowband regions with the BS. At least one processor configured to perform, and wherein the communicating comprises sending an SRS on the determined resource; and a memory coupled to the at least one processor. including.

[0029] Certain aspects of the present disclosure provide an apparatus for wireless communication by a UE. The apparatus generally comprises means for determining a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions and one or more DL narrowband regions for communicating with a BS. Means for determining resources for transmission of SRSs in at least one of one or more UL narrowband regions, comprising one or more UL narrowband regions, and using the narrowband regions And communicating with the BS, where communicating comprises transmitting an SRS on the determined resource.

[0030] Certain aspects of the present disclosure provide a computer-readable medium for wireless communication by a UE. The computer-readable medium generally comprises code for determining a plurality of narrowband regions partitioned from the system bandwidth and one or more DL narrowband regions for the plurality of narrowband regions to communicate with a BS. A code for determining resources for transmission of an SRS in at least one of the one or more UL narrowband regions, the narrowband region comprising: For communicating with a BS using, wherein communicating comprises transmitting an SRS on a determined resource.

[0031] Numerous other aspects are provided, including methods, apparatus, systems, computer program products, computer readable media, and processing systems.

[0032] For a better understanding of the above-cited features of the present disclosure, a more specific description briefly summarized above is given by reference to the aspects, some of which are illustrated in the accompanying drawings. Can be obtained. However, since the description may lead to other equally effective aspects, the accompanying drawings show only some exemplary aspects of the present disclosure and are therefore not to be considered as limiting the scope of the present disclosure. Note that it is not.

FIG. 3 is a block diagram conceptually illustrating an exemplary wireless communication network in accordance with certain aspects of the present disclosure. FIG. 3 is a block diagram conceptually illustrating an example of an evolved Node B (eNB) in communication with a user equipment (UE) in a wireless communication network, according to some aspects of the disclosure. FIG. 3 is a block diagram conceptually illustrating an exemplary frame structure for a particular Radio Access Technology (RAT) for use in a wireless communication network, in accordance with certain aspects of the present disclosure. FIG. 6 illustrates an exemplary subframe format for a downlink with a normal cyclic prefix, according to some aspects of the present disclosure. FIG. 8 illustrates an example of machine type communication (MTC) coexistence with other wireless communication in a broadband system, such as LTE, according to some aspects of the present disclosure. FIG. 8 illustrates an example of machine type communication (MTC) coexistence with other wireless communication in a broadband system, such as LTE, according to some aspects of the present disclosure. FIG. 6 illustrates an exemplary mapping of DL narrowband region to UL narrowband region in accordance with certain aspects of the present disclosure. FIG. 6 illustrates an exemplary mapping of DL narrowband region to UL narrowband region in accordance with certain aspects of the present disclosure. FIG. 6 illustrates an exemplary mapping of DL narrowband region to UL narrowband region in accordance with certain aspects of the present disclosure. FIG. 6 illustrates example operations for wireless communication that may be performed by a BS, according to certain aspects of the present disclosure. FIG. 6 illustrates example operations for wireless communication that may be performed by a UE, according to certain aspects of the present disclosure. FIG. 6 illustrates an exemplary frequency hopping pattern for DL and UL narrowband regions, according to some aspects of the present disclosure. FIG. 6 illustrates an example technique for reserving transmission resources, according to some aspects of the present disclosure. FIG. 6 illustrates example operations for wireless communication that may be performed by a BS, according to certain aspects of the present disclosure. FIG. 6 illustrates example operations for wireless communication that may be performed by a UE, according to certain aspects of the present disclosure. FIG. 6 illustrates an example technique for allocation of transmission resources according to some aspects of the disclosure. FIG. 6 illustrates example operations for wireless communication that may be performed by a BS, according to certain aspects of the present disclosure. FIG. 6 illustrates example operations for wireless communication that may be performed by a UE, according to certain aspects of the present disclosure.

Detailed description

[0050] Aspects of the disclosure provide techniques and apparatus for narrowband management for devices with limited communication resources, such as low cost (LC) MTC devices, LC eMTC devices, or IoT devices. These devices may co-exist with other legacy devices in a particular Radio Access Technology (RAT) (eg, Long Term Evolution (LTE)) and the available system bandwidth supported by the particular RAT (eg, LTE). It may operate on one or more narrow band regions separated from the width. Uplink (UL) system bandwidth and downlink (DL) system bandwidth may be partitioned into narrowband regions. A portion of the UL system bandwidth and/or a portion of the DL system bandwidth may be reserved for other use and may not be included in any of the narrow band areas. Further, UL and DL system bandwidth transmission resources may be allocated for transmission of the Sounding Reference Signal (SRS).

[0051] Accordingly, as described in more detail below, the techniques presented herein relate to the manner in which cells and MTC devices are used to organize UL system bandwidth into narrowband regions. May allow DL system bandwidth to be organized into narrowband regions in different ways. Techniques are provided for reserving transmission resources included in the UL narrowband region for use by legacy PUCCH transmissions, also as described in more detail below. And, as described in more detail below, techniques are provided for allocating transmission resources for the transmission of SRSs such that all of the transmission resources for each SRS are within the narrowband region.

[0052] The techniques described herein include code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA. It may be used for various wireless communication networks, such as (SC-FDMA) networks. The terms "network" and "system" are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000. UTRA includes Wideband CDMA (W-CDMA®), Time Division Synchronous CDMA (TD-SCDMA), and other variants of CDMA. cdma2000 covers IS-2000, IS-95 and IS-856 standards. TDMA networks may implement wireless technologies such as Global System for Mobile Communications (GSM®). The OFDMA network includes Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.11 (WiMAX (registered trademark)), and IEEE802.20. , Flash-OFDM® may be implemented. UTRA and E-UTRA are part of the Universal Mobile Telecommunication System (UMTS). 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) in both Frequency Division Duplex (FDD) and Time Division Duplex (TDD) utilize OFDMA on the downlink and SC on the uplink. -A new release of UMTS that uses E-UTRA with FDMA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein may be used for the wireless networks and radio technologies mentioned above, as well as other wireless networks and radio technologies. For clarity, some aspects of the techniques are described below for LTE/LTE-A and LTE/LTE-A terminology is used in much of the description below. LTE and LTE-A are commonly referred to as LTE.

[0053] FIG. 1 illustrates an exemplary wireless communication network 100 with a base station (BS) and user equipment (UE) in which aspects of the present disclosure may be practiced.

[0054] The wireless communication network 100 may be an LTE network or some other wireless network. Wireless communication network 100 may include a number of evolved Node Bs (eNBs) 110 and other network entities. An eNB is an entity that communicates with user equipment (UE) and is sometimes referred to as a base station, node B, access point (AP), and so on. Each eNB may provide communication coverage for a particular geographical area. In 3GPP, the term "cell" may refer to the coverage area of an eNB and/or the eNB subsystem serving this coverage area, depending on the context in which the term is used.

[0055] The eNB may provide communication coverage for macro cells, pico cells, femto cells, and/or other types of cells. A macro cell may cover a relatively large geographical area (eg, a few kilometers in radius) and may allow unrestricted access by UEs that subscribe to the service. A pico cell may cover a relatively small geographical area and may allow unlimited access by UEs subscribing to the service. A femtocell may cover a relatively small geographical area (eg, home) and may allow restricted access by UEs having an association with the femtocell (eg, UEs in a limited subscriber group (CSG)). .. An eNB for a macro cell may be referred to as a macro eNB. An eNB for a pico cell may be referred to as a pico eNB. An eNB for a femto cell may be referred to as a femto eNB or home eNB (HeNB). In the example shown in FIG. 1, eNB 110a may be a macro eNB for macro cell 102a, eNB 110b may be a pico eNB for pico cell 102b, and eNB 110c may be a femto eNB for femto cell 102c. The eNB may support one or more (eg, three) cells. The terms "eNB", "base station", and "cell" may be used interchangeably herein.

[0056] The wireless communication network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (eg, eNB or UE) and send the transmission of data to a downstream station (eg, UE or eNB). A relay station may also be a UE that can relay transmissions to other UEs. In the example shown in FIG. 1, the relay (station) eNB 110d may communicate with the macro eNB 110a and the UE 120d to enable communication between the eNB 110a and the UE 120d. A relay station may also be called a relay eNB, a relay base station, a relay, etc.

[0057] The wireless communication network 100 may be a heterogeneous network that includes different types of eNBs, eg, macro eNBs, pico eNBs, femto eNBs, relay eNBs, and the like. These different types of eNBs may have different transmit power levels, different coverage areas, and different impact on interference in the wireless communication network 100. For example, macro eNBs may have high transmit power levels (eg, 5-40W), while pico eNBs, femto eNBs, and relay eNBs have lower transmit power levels (eg, 0.1-2W). You can

[0058] The network controller 130 may be coupled to the set of eNBs and may coordinate and control these eNBs. The network controller 130 may communicate with the eNB via the backhaul. The eNBs may also communicate with each other directly or indirectly via, for example, a wireless backhaul or wireline backhaul.

[0059] UEs 120 (eg, 120a, 120b, 120c) may be distributed throughout wireless communication network 100, and each UE may be fixed or mobile. A UE may also be referred to as an access terminal, terminal, mobile station (MS), subscriber unit, station (STA), etc. A UE is a cellular phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet, smartphone, navigation device, entertainment device (eg, Gaming devices, music players), cameras, netbooks, smartbooks, ultrabooks, wearable devices (eg smart glasses/goggles, smartwatches, smart wristbands, smart bracelets, smart clothing, head-up displays), drones, robots/ It can be a robotic device, a medical device, a vehicle device, etc. MTC UEs may include sensors, meters, monitors, location tags, drones, trackers, robot/robotic devices, etc. MTC UEs, as well as other UEs, may be implemented as internet of things (IoT) devices (eg, narrowband IoT (NB-IoT)) or all internet of things (IoT) devices. To extend the coverage of some devices, such as MTC or IoT devices, "bundling" may be utilized in which some transmissions are sent as a bundle of transmissions, eg, multiple transmissions. The same information is transmitted on the subframe.

[0060] The one or more UEs 120 in the wireless communication network 100 (eg, an LTE network) may also be low cost (LC), low data rate devices, such as, for example, LC MTC UE, LC eMTC UE. LC UEs may co-exist with legacy and/or advanced UEs in LTE networks and may have limited capability or capabilities compared to other UEs (eg, non-LC UEs) in wireless networks. .. For example, compared to legacy and/or advanced UEs in LTE networks, LC UEs have a reduced maximum bandwidth (relative to legacy UEs), a single received radio frequency (RF) chain, reduced peak rate, transmitted power. , Rank 1 transmission, half-duplex operation, and so on. As used herein, devices with limited communication resources, such as MTC devices, eMTC devices, IoT (eg, NB-IoT) devices, are generally referred to as LC UEs. Similarly, legacy devices such as legacy (eg, in LTE) and/or advanced UEs are generally referred to as non-LC UEs.

[0061] FIG. 2 is a block diagram of a design of a BS/eNB 110 that may be one of the BS/eNB 110 in FIG. 1 and a UE 120 that may be one of the UEs 120 in FIG. 1, respectively. BS 110 may be equipped with T antennas 234a-234t and UE 120 may be equipped with R antennas 252a-252r, provided that T≧1 and R≧1 in general.

[0062] At BS 110, a transmit processor 220 receives data from a data source 212 for one or more UEs and one or more for each UE based on a channel quality indicator (CQI) received from the UE. Of modulation and coding schemes (MCS) of the UEs, processing (eg, encoding and modulating) data for each UE based on the selected MCS(s) for that UE, all Data symbols may be provided for the UEs. The transmit processor 220 also processes system information (eg, for semi-static resource partitioning information (SRPI), etc.) and control information (eg, CQI requests, grants, higher layer signaling, etc.). And may provide overhead symbols and control symbols. Processor 220 also generates reference symbols for reference signals (eg, common reference signals and synchronization signals (eg, primary synchronization signal (PSS) and secondary synchronization signal (SSS)). A transmit (TX) multiple input multiple output (MIMO) processor 230 performs spatial processing (eg, precoding) on data symbols, control symbols, overhead symbols, and/or reference symbols, where applicable. Then, the T output symbol streams may be provided to T modulators (MODs) 232a through 232t, each MOD 232 having a respective output symbol (eg, for OFDM, etc.) to obtain an output sample stream. Each MOD 232 may further process (eg, convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.Modulators 232a-232t. Downlink signals from the antennas may be transmitted via T antennas 234a-234t, respectively.

[0063] At UE 120, antennas 252a-252r may receive downlink signals from BS 110 and/or other BSs and may provide the received signals to demodulators (DEMODs) 254a-254r, respectively. Each DEMOD 254 may condition (eg, filter, amplify, downconvert, and digitize) its received signal to obtain input samples. Each DEMOD 254 may further process input samples (eg, for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain received symbols from all R demodulators 254a-254r, perform MIMO detection on the received symbols, if applicable, and provide the detected symbols. Receive processor 258 processes (eg, demodulates and decodes) the detected symbols, provides decoded data for UE 120 to data sink 260, and provides decoded control signals and system information to controller/processor 280. obtain. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), CQI, etc.

[0064] On the uplink, at UE 120, a transmit processor 264 causes data from data source 262 and control information from controller/processor 280 (eg, for reports comprising RSRP, RSSI, RSRQ, CQI, etc.). And can be received and processed. Processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by TX MIMO processor 266, where applicable, further processed by MODs 254a-254r (eg, for SC-FDM, OFDM, etc.) and transmitted to BS 110. At BS 110, uplink signals from UE 120 and other UEs are received by antenna 234, processed by DEMOD 232, detected by MIMO detector 236 where applicable, and decoded data sent by UE 120 and It may be further processed by the receive processor 238 to obtain control information. Processor 238 may provide the decoded data to data sink 239 and the decoded control information to controller/processor 240. BS 110 includes a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller/processor 290, and a memory 292.

[0065] Controllers/processors 240 and 280 may direct the operation at BS 110 and UE 120, respectively. For example, controller/processor 240 and/or other processors and modules at BS 110 may perform the operations illustrated in FIGS. 9, 13, 16 and/or other processes for the techniques described herein. Can do or direct. Similarly, controller/processor 280 and/or other processors and modules at UE 120 perform processes for the operations shown in FIGS. 10, 14, 17 and/or the techniques described herein. Or you can tell. Memories 242 and 282 may store data and program codes for BS 110 and UE 120, respectively. The scheduler 246 may schedule the UE for data transmission on the downlink and/or uplink.

[0066] FIG. 3 illustrates an exemplary frame structure 300 for FDD in LTE. The transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be partitioned into 10 subframes with indices 0-9. Each subframe may include two slots. Therefore, each radio frame may include 20 slots with indices of 0-19. Each slot may include L symbol periods, eg, 7 symbol periods for a normal cyclic prefix (as shown in FIG. 3 ) or 6 symbol periods for an extended cyclic prefix. .. The 2L symbol periods in each subframe may be assigned indices 0-2L-1.

[0067] In LTE, the eNB may send a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) on the downlink at 1.08 MHz center of the system bandwidth for each cell supported by the eNB. .. The PSS and SSS may be transmitted during symbol periods 6 and 5 in subframes 0 and 5 of each radio frame with a normal cyclic prefix, respectively, as shown in FIG. PSS and SSS may be used by the UE for cell search and acquisition. The eNB may send a cell-specific reference signal (CRS) over the system bandwidth for each cell supported by the eNB. The CRS may be transmitted during some symbol periods of each subframe and may be used by the UE to perform channel estimation, channel quality measurement, and/or other functions. The eNB may also send a physical broadcast channel (PBCH) during symbol periods 0-3 in slot 1 of some radio frames. The PBCH may carry some system information. The eNB may send other system information such as a system information block (SIB) on a physical downlink shared channel (PDSCH) in some subframes. The eNB may send control information/data on a physical downlink control channel (PDCCH) during the first B symbol periods of the subframe, where B is for each subframe. Can be configurable. The eNB may send traffic data and/or other data on the PDSCH during the remaining symbol periods of each subframe.

[0068] PSS, SSS, CRS, and PBCH in LTE are described in 3GPP TS 36.211 titled "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation", which is publicly available.

[0069] FIG. 4 shows two exemplary subframe formats 410 and 420 for the downlink with a normal cyclic prefix. The available time frequency resources for the downlink may be partitioned into resource blocks. Each resource block may cover 12 subcarriers in one slot and may include several resource elements. Each resource element may cover one subcarrier during one symbol period and may be used to send one modulation symbol, which may be real-valued or complex-valued.

[0070] Subframe format 410 may be used for an eNB equipped with two antennas. The CRS may be transmitted from antennas 0 and 1 during symbol periods 0, 4, 7, and 11. The reference signal is a signal known a priori by the transmitter and receiver and is sometimes referred to as the pilot. The CRS is a cell-specific reference signal generated based on, for example, cell identification information (ID). In FIG. 4, for a given resource element with label Ra, antenna a may transmit modulation symbols on that resource element and other antennas may not transmit modulation symbols on that resource element. Subframe format 420 may be used for an eNB equipped with four antennas. The CRS may be transmitted from antennas 0 and 1 during symbol periods 0, 4, 7 and 11 and from antennas 2 and 3 during symbol periods 1 and 8. For both subframe formats 410 and 420, the CRS may be transmitted on evenly spaced subcarriers, which may be determined based on cell ID. Different eNBs may send their CRS on the same or different subcarriers depending on their cell ID. For both subframe formats 410 and 420, resource elements not used for CRS may be used to send data (eg, traffic data, control data, and/or other data).

[0071] An interlace structure may be used for each of the downlink and uplink for FDD in LTE. For example, Q interlaces with indices from 0 to Q-1 may be defined, where Q may be equal to 4, 6, 8, 10, or some other value. Each interlace may include subframes separated by Q frames. In particular, interlace q may include subframes q, q+Q, q+2Q, etc., where qε{0,. ． ． , Q-1}.

[0072] The wireless network may support hybrid automatic repeat request (HARQ) for data transmission on the downlink and uplink. For HARQ, the transmitter (eg, eNB 110) sends one or more packets of the packet until the packet is correctly decoded by the receiver (eg, UE 120) or some other termination condition is encountered. Can be sent. For synchronous HARQ, all transmissions of a packet may be sent in a single interlaced subframe. For asynchronous HARQ, each transmission of the packet may be sent in any subframe.

[0073] A UE may be located within the coverage of multiple eNBs. One of these eNBs may be selected to serve that UE. The serving eNB may be selected based on various criteria such as received signal strength, received signal quality, path loss, and so on. Received signal quality may be quantified by a signal to interference plus noise ratio (SINR), or reference signal received quality (RSRQ), or some other metric. The UE may operate in a dominant interference scenario where the UE may observe high interference from one or more interfering eNBs.

[0074] As described above, one or more UEs in a wireless communication network (eg, wireless communication network 100) may be compared to other (non-LC) devices in the wireless communication network such as LC UEs, It may be a device with limited communication resources.

[0075] In some systems, eg, LTE Rel-13, an LC UE is limited to a particular narrowband allocation (eg, of 6 resource blocks (RBs) or less) within the available system bandwidth. Can be done. However, the LC UE may retune (eg, operate and/or camping) to a different narrowband region within the available system bandwidth of the LTE system, eg, to coexist within the LTE system. Can be

[0076] As another example of coexistence within an LTE system, an LC UE may be a legacy physical broadcast channel (PBCH) (eg, an LTE physical channel that generally carries parameters that may be used for initial access to a cell). May be received (in repetition) and may support one or more legacy physical random access channel (PRACH) formats. For example, the LC UE may be able to receive the legacy PBCH with one or more additional repetitions of the PBCH over multiple subframes. As another example, the LC UE may be able to send one or more repetitions of PRACH to the eNB in the LTE system (eg, one or more PRACH formats are supported). The PRACH may be used to identify the LC UE. Also, the number of repeated PRACH attempts may be configured by the eNB.

[0077] The LC UE may also be a link budget limiting device that operates in different modes of operation based on its link budget limitation (eg, with different amounts of repeated messages sent to or from the LC UE). You can For example, in some cases, the LC UE may have little repetition (eg, the UE may require a small amount of repetition to successfully receive and/or transmit a message, or even repetition). It may operate in normal coverage mode (which may not be needed). Alternatively, in some cases, the LC UE may operate in coverage enhancement (CE) mode, which may have a large amount of repetition. For example, for a 328-bit payload, an LC UE in CE mode may require 150 or more iterations of the payload to successfully receive the payload.

[0078] In some cases, eg, also for LTE Rel-13, the LC UE may have limited capabilities for its reception of broadcast and unicast transmissions. For example, the maximum transport block (TB) size for broadcast transmissions received by the LC UE may be limited to 1000 bits. Moreover, in some cases, the LC UE may not be able to receive more than one unicast TB in a subframe. In some cases (eg, both CE mode and normal mode described above), the LC UE may not be able to receive more than one broadcast TB in a subframe. Moreover, in some cases, the LC UE may not be able to receive both unicast TB and broadcast TB in the subframe.

[0079] In the case of MTC, the LC UE coexisting in the LTE system may also send new messages for some procedures such as paging, random access procedure (eg, the conventional messages used in LTE for these procedures). Support (as opposed to messages). In other words, these new messages for paging, random access procedures, etc. may be separate from the messages used for similar procedures associated with non-LC UEs. For example, compared to conventional paging messages used in LTE, LC UEs can monitor and/or receive paging messages that non-LC UEs may not be able to monitor and/or receive. possible. Similarly, the LC UE also receives RAR messages that may not be able to be received by non-LC UEs, as compared to conventional Random Access Response (RAR) messages used in conventional random access procedures. It may be possible to: New paging and RAR messages associated with LC UEs may also be repeated (eg, “bundled”) one or more times. Moreover, different repetition numbers (eg, different bundling sizes) may be supported for new messages.

Exemplary MTC Coexistence with Other Wireless Communications in a Broadband System
[0080] As mentioned above, MTC and/or eMTC operation may be supported in a wireless communication network (eg, in the coexistence with LTE or some other RAT). 5A and 5B show an example of how LC UEs operating, eg, MTC, may co-exist in a broadband system such as LTE.

[0081] As shown in the example frame structure of FIG. 5A, subframes 502, 504, 506 associated with MTC and/or eMTC operation are standard subframes 510 associated with LTE or some other RAT. , 512, 514 and time division multiplexed (TDM). Within a cell, some MTC subframes may be scheduled regularly, and the schedule of MTC subframes is signaled to MTC UEs in the cell, for example by broadcasting from BS supporting the cell. Other MTC subframes may be dynamically scheduled by the BS as needed, and the BS may dynamically schedule MTC, eg, in broadcast or unicast communication during regularly scheduled MTC subframes. Send subframe instructions.

[0082] Additionally or alternatively, one or more narrowband regions 520, 522 used by the LC UE in the MTC are supported by LTE, as shown in the exemplary frame structure of FIG. 5B. It may be frequency division multiplexed within a wider bandwidth 530. Multiple narrowband regions may be supported for MTC and/or eMTC operation, with each narrowband region spanning a total bandwidth of 6 or less RBs. In some cases, each LC UE in MTC operation may operate in one narrowband region at a time (eg, at 1.4 MHz or 6 RBs). However, the LC UE in MTC operation may retune to other narrowband regions in the wider system bandwidth at a given time. In some examples, multiple LC UEs may be served by the same narrowband region. In another example, multiple LC UEs may be served by different narrowband regions (eg, each narrowband region spans 6 RBs). In yet another example, different combinations of LC UEs may be served by the same narrow band region(s) and/or different narrow band regions(s).

[0083] The LC UE may operate (eg, monitor/receive/transmit) in a narrowband region for a variety of different operations. For example, as shown in FIG. 5B, a first narrowband region 520 (eg, over 6 RBs of system bandwidth or less) of a subframe 540 includes a PSS, SSS, PBCH, MTC system information block ( SIB) or paging transmissions from BSs in wireless communication networks may be monitored by one or more LC UEs. As also shown in FIG. 5B, a second narrowband region 522 of subframe 542 (eg, also over 6 RBs of system bandwidth) is preconfigured in the signaling received from the BS. It can be used by the LC UE to transmit the RACH or data. In some cases, the second narrowband region may be utilized by the same LC UE that utilized the first narrowband region (eg, LC UE may transmit after monitoring in the first narrowband region). May be retuned to the second narrow band region in order to). In some cases (not shown), the second narrowband region may be utilized by an LC UE that is different than the LC UE that utilized the first narrowband region.

[0084] Although the example described herein relates to a narrow band of 6 RBs, the techniques presented herein may also be applied to narrow band regions of different sizes, eg, 1 RB, Those skilled in the art will recognize.

Exemplary Narrow Band Management for MTC
[0085] As mentioned above, for example, in some systems, such as LTE Rel-13, narrowband operation for MTC (eg, eMTC) may be supported. Cells that support narrowband operation for MTC may have different system bandwidths for downlink (DL) and uplink (UL) operation. A cell having different DL system bandwidths and different UL system bandwidths organizes DL system bandwidth into narrowband regions in a manner different from that used to organize UL system bandwidth into narrowband regions. You can Accordingly, aspects of the disclosure provide techniques for organizing DL system bandwidth and UL system bandwidth into a narrow band region.

[0086] A cell supporting narrowband operation for MTC UEs and legacy UEs may receive legacy PUCCH transmissions from legacy UEs. Legacy PUCCH transmissions may be transmitted at either or both edges of the UL system bandwidth of the cell. Accordingly, aspects of the present disclosure provide techniques for reserving transmission resources included in the UL narrowband region for use by legacy PUCCH transmissions. Similar reservations may also be applied in the DL narrowband region for use by other legacy DL signals or channels.

[0087] Further, a cell supporting narrowband operation for MTC may support transmission of a sounding reference signal (SRS). The current minimum defined bandwidth for SRS transmission is 4 RBs. However, as mentioned above, the bandwidth of the narrow band region can be 6 RBs. The fact that 6 RBs are not completely divisible by 4 RBs presents a challenge in managing SRS transmissions using 4 RBs in 6RB-based narrowband operation. Accordingly, aspects of the disclosure provide techniques for allocating transmission resources for transmission of SRSs in cells that support narrowband operation (eg, for MTC).

[0088] A cell operating with FDD may have a DL system bandwidth that is a different size than the UL system bandwidth of the cell. For example, the cell may perform DL operation in the 10 MHz system bandwidth and UL operation in the 5 MHz system bandwidth. To support MTC operation and MTC UE, a cell may organize DL system bandwidth and UL system bandwidth into a narrow band region, or into a narrow band region. The eNB or other BS controlling the cell may allocate the DL narrowband region for the MTC UE to monitor the signals from the eNB to the MTC UE. Similarly, the eNB (or other BS) may allocate the UL narrowband region to the MTC UE for use by the MTC when transmitting UL signals. In this example, the cell organizes the DL system bandwidth into 8 DL narrowband regions, but it may organize the UL system bandwidth into 4 UL narrowband regions.

[0089] When a BS (for example, an eNB or a cell) supports an MTC UE having a DL system bandwidth and a UL system bandwidth of a cell organized in a narrow band area, the BS sends the DL narrow band to the MTC UE. A mapping may be established between the DL narrowband region and the UL narrowband region such that allocating the region implies assignment of the UL narrowband region to the MTC UE. Having a mapping enables the BS to simplify the scheduling of resources in the cell, eg, the BS may send for transmission on the DL narrowband region to the MTC UE on the corresponding UL narrowband region. ACK/NAK can be expected. Similarly, the MTC UE monitors the DL transmissions on the assigned DL narrowband area for the MTC UEs and responds with a transmission on the corresponding UL narrowband area.

[0090] According to an aspect of the present disclosure, a technique for mapping a UL narrowband region and a DL narrowband region by a BS is provided. The BS determines the minimum size of UL system bandwidth and DL system bandwidth supported by the BS, determines the number of narrowband regions that can be organized in the determined size, and then Both DL system bandwidth and UL system bandwidth may be organized in. The BS may then map each DL narrowband region into one UL narrowband region.

[0091] FIG. 6 shows an exemplary mapping 600 of DL narrowband regions to UL narrowband regions, as described above. Such mapping may be employed by eNB 110a in FIG. 1, for example. Although FIG. 6 shows the DL system bandwidth 610 and the UL system bandwidth 650 as clearly in the same frequency range, the DL system bandwidth and the UL system bandwidth are in a cell using FDD. Are in different frequency ranges. The DL system bandwidth 610 is 10 MHz or 50 RB width and the UL system bandwidth 650 is 5 MHz or 25 RB width. The BS supporting the MTC UE while operating the DL system bandwidth 610 and the UL system bandwidth 650 may determine that the UL system bandwidth 650 is less than the DL system bandwidth 610 (ie, the UL system bandwidth 650 The 5 MHz size is the minimum size of the UL system bandwidth 650 and the DL system bandwidth 610). The BS may then determine that the BS can organize four narrowband regions 652, 654, 656, and 658 from the UL system bandwidth 650. The BS may then decide to organize four narrowband regions from the DL system bandwidth and may form DL narrowband regions 612, 614, 616, and 618 from the DL system bandwidth. The BS then maps DL narrowband region 612 to UL narrowband region 652, DL narrowband region 614 to UL narrowband region 654, DL narrowband region 616 to UL narrowband region 656, The DL narrowband region 618 may be mapped to the UL narrowband region 658.

[0092] According to an aspect of the present disclosure, another technique for mapping a UL narrowband region and a DL narrowband region by a BS is provided. The BS determines the number of DL narrowband regions that can be organized from the BS DL system bandwidth and the number of UL narrowband regions that can be organized from the BS UL system bandwidth, and determines the determined number of DL narrowband regions. Regions and UL narrowband regions may be organized and then a mapping of DL narrowband regions to UL narrowband regions may be determined. The BS may map more than one DL narrowband region to each UL narrowband region or more than one UL narrowband region to each DL narrowband region. If the BS maps two or more DL narrowband regions into one UL narrowband region, the BS will ensure that the response from the first UE (eg ACK/NAK) does not interfere with the responses from other UEs. In such a manner, transmissions to MTC UEs using the DL narrowband region may be scheduled. Similarly, if the BS maps two or more UL narrowband regions into one DL narrowband region, the BS will ask the two MTC UEs to reply from the BS (eg DL narrowband region) that the MTC UE will collide with. May be scheduled from the MTC using UL narrowband region such that it does not expect ACK/NAK in the same resource element of the same resource block of.

[0093] FIG. 7 shows an exemplary mapping 700 of DL narrowband regions to UL narrowband regions, as described above. Such mapping may be employed by eNB 110a in FIG. 1, for example. FIG. 7 shows the DL system bandwidth 710 and the UL system bandwidth 750 as clearly in the same frequency range, but the DL system bandwidth and the UL system bandwidth are in a cell using FDD. Are in different frequency ranges. The DL system bandwidth is 10 MHz or 50 RB width and the UL system bandwidth is 5 MHz or 25 RB width. A BS supporting MTC UE while operating DL system bandwidth and UL system bandwidth determines that the BS can organize four narrowband regions 752, 754, 756, and 758 from the UL system bandwidth. You can The BS may then determine that the BS can organize eight narrowband regions 712, 714, 716, 718, 720, 722, 724, and 726 from the DL system bandwidth. The BS may then organize 8 narrowband regions from the DL system bandwidth and 4 UL narrowband regions from the UL system bandwidth. The BS then maps DL narrowband regions 712 and 714 to UL narrowband region 752, DL narrowband regions 716 and 718 to UL narrowband region 754, and DL narrowband regions 720 and 722 to UL narrowband. Region 756 may be mapped and DL narrowband regions 724 and 726 may be mapped to UL narrowband region 758. The BS may use DL narrowband region 712 or DL narrowband region 712 in a manner such that a reply from an MTC UE that uses UL narrowband region 752 does not interfere with a reply from another MTC UE that uses UL narrowband region 752. Transmissions to MTC UEs using region 714 may be scheduled.

[0094] According to aspects of the present disclosure, the mapping of the DL narrowband region to the UL narrowband region may be UE specific. That is, the mapping of DL narrowband region to UL narrowband region may be applied to a particular UE (eg, MTC UE) served by a cell, and other UEs served by that cell may be Different mappings of DL narrowband regions to band regions may be used. The BS (eg, eNodeB 110a in FIG. 1) may signal various mapping indications to be used for the UEs served in the cell. For example, and with reference to FIG. 7, the BS maps DL narrowband regions 712 and 714 to UL narrowband region 752 for the first MTC UE, but UL narrowband regions 716 and 718 for the second MTC UE. It may be mapped to the narrow band region 752.

[0095] According to aspects of the present disclosure, the mapping of the DL narrowband region to the UL narrowband region may be common to multiple UEs. For example, the mapping of DL narrowband region to UL narrowband region may be applied to all MTC UEs served by the cell, but other cells in the network may use different mappings. In the second example, the BS may use the first mapping for the first group of MTC UEs, while the BS uses the second mapping for the second group of MTC UEs. In the second example, the BS may schedule (eg, permanently schedule) MTC UEs on different sets of MTC subframes that occur regularly. The BS (eg, eNode B 110a in FIG. 1) may signal the mapping indication(s) to each of the UEs in a broadcast transmission or in one or more dedicated messages.

[0096] FIG. 8 shows an exemplary mapping 800 of DL narrowband regions to UL narrowband regions, as described above. Such mapping may be employed by eNB 110a with UEs 120a and 120c in FIG. 1, for example. FIG. 8 shows the DL system bandwidth 810 and the UL system bandwidth 850 as clearly in the same frequency range, but the DL system bandwidth and the UL system bandwidth are in a cell using FDD. Are in different frequency ranges. The DL system bandwidth is 10 MHz or 50 RB width and the UL system bandwidth is 5 MHz or 25 RB width. A BS that supports MTC UEs (eg, UEs 120a and 120c) while operating both DL system bandwidth and UL system bandwidth, may have four narrow band regions 852, 854, 856, and 858 that the BS may derive from the UL system bandwidth. You may decide that you can organize. The BS may then determine that the BS can organize eight narrowband regions 812, 814, 816, 818, 820, 822, 824, and 826 from the DL system bandwidth. The BS may then organize 8 narrowband regions from the DL system bandwidth and 4 UL narrowband regions from the UL system bandwidth. The BS then maps DL narrowband region 812 to UL narrowband region 852 and DL narrowband region 814 to UL narrowband region 854 for the first UE (eg, UE1 or UE 120a from FIG. 1). However, the DL narrow band region 816 may be mapped to the UL narrow band region 856 and the DL narrow band region 818 may be mapped to the UL narrow band region 858. The BS also maps DL narrowband region 820 to UL narrowband region 852 and DL narrowband region 822 to UL narrowband region 854 for the second UE (eg, UE2 or UE 120c from FIG. 1). , DL narrow band region 824 may be mapped to UL narrow band region 856 and DL narrow band region 826 may be mapped to UL narrow band region 858.

[0097] FIG. 9 illustrates example operations 900 for wireless communication that may be performed by a BS (eg, eNode B 110a in FIG. 1) in accordance with aspects of the present disclosure. Act 900 may be performed by a BS to support MTC UEs and may use one or another of the example mappings shown in FIGS. 6-8.

[0098] Operation 900 begins at block 902, where the BS determines a set of DL narrowband regions partitioned from downlink (DL) system bandwidth. For example, and referring to FIG. 6, the BS may determine a set of 4 DL narrowband regions 612, 614, 616, 618 from a DL system bandwidth 610 of 10 MHz or 50 RBs. The BS may determine the DL narrowband region, for example, by referencing a network standard or performing an algorithm.

[0099] Operation 900 continues at block 904, where the BS determines a set of UL narrowband regions partitioned from the uplink (UL) system bandwidth. Continuing the example with reference to FIG. 6, the BS may determine that the set of four UL narrowband regions 652, 654, 656, 658 is partitioned from the UL system bandwidth 650 of 5 MHz or 25 RBs. ..

[00100] At block 906, the BS determines a mapping between the set of DL narrowband regions and the set of UL narrowband regions. Continuing with the example with reference to FIG. 6, the BS maps the first DL narrowband region 612 to the first UL narrowband region 652 and the second DL narrowband region 614 to the second UL narrowband region. It may be determined to map to region 654, the third DL narrowband region 616 maps to the third UL narrowband region 656, and the fourth DL narrowband region 618 maps to the fourth UL narrowband region 658. ..

[00101] Operation 900 continues at block 908, where the BS communicates with at least user equipment (UE) using at least one of the DL narrowband regions or UL narrowband regions included in the mapping. .. Continuing with the example with reference to FIG. 6, the BS may transmit to the UE (eg, UE 120a shown in FIG. 1) using the first DL narrowband region 612.

[00102] FIG. 10 illustrates example operations 1000 for wireless communication that may be performed by a UE (eg, UE 120a in FIG. 1) in accordance with aspects of the present disclosure. Operation 1000 may be performed by, for example, an MTC UE and may use one of the example mappings shown in FIGS. 6-8, or another mapping.

[00103] Operation 1000 begins at block 1002, where the UE determines a set of DL narrowband regions partitioned from the downlink (DL) system bandwidth. Continuing with the example with reference to FIG. 6, the UE may determine that the set of four DL narrowband regions 612, 614, 616, 618 is partitioned from the DL system bandwidth 610 of 10 MHz or 50 RBs. .. The UE may determine the DL narrowband region, for example, by referencing the network standard or decoding the broadcast message from the BS.

[00104] Operation 1000 continues at block 1004, where the UE determines a set of UL narrowband regions partitioned from the uplink (UL) system bandwidth. Continuing with the example with reference to FIG. 6, the UE may determine that the set of four UL narrowband regions 652, 654, 656, 658 is partitioned from the UL system bandwidth 650 of 5 MHz or 25 RBs. .. The UE may determine the DL narrowband region, for example, by referencing the network standard or decoding the broadcast message from the BS.

[00105] At block 1006, the UE determines a mapping between a set of DL narrowband regions and a set of UL narrowband regions. The mapping may be explicitly signaled or implicit, as described. Continuing with the example with reference to FIG. 6, the UE maps the first DL narrowband region 612 to the first UL narrowband region 652 and the second DL narrowband region 614 to the second UL narrowband region. It may be determined to map to region 654, the third DL narrow band region 616 maps to the third UL narrow band region 656, and the fourth DL narrow band region 618 maps to the fourth UL narrow band region 658. ..

[00106] Operation 1000 continues at block 1008, where the UE communicates with a base station (BS) using at least one of the DL narrowband region or the UL narrowband region included in the mapping. Continuing with the example with reference to FIG. 6, the UE may receive a transmission from the BS in the first DL narrowband region 612.

[00107] According to an aspect of the present disclosure, a cell that divides the UL system bandwidth and the DL system bandwidth into a narrow band region may use frequency hopping using the narrow band region. The cell may, for example, determine a frequency hopping pattern for the DL narrow band region and UL narrow band region allocations based on network standards. A UE operating in a cell using frequency hopping with a narrow band region allocates a DL narrow band region and a UL narrow band region based on, for example, a received signal indicating one or more frequency hopping patterns. And a frequency hopping pattern can be determined.

[00108] The cell may use a different frequency hopping pattern for the DL narrowband region than the cell uses for the UL narrowband region. That is, the cell divides the DL system bandwidth into multiple narrowband regions and to UE hops across the DL system bandwidth such that the UE may retune to several narrowband regions while operating in the cell. It may have a narrow band region allocation. Similarly, the cell divides the UL system bandwidth into multiple narrowband regions and to UE hops across the UL system bandwidth such that the UE may retune to several narrowband regions while operating in the cell. May have narrowband region allocations of Frequency hopping in the DL narrowband region and frequency hopping in the UL narrowband region may each follow a pattern, but the patterns may be different.

[00109] FIG. 11 illustrates an exemplary frequency hopping pattern 1100 for the DL narrowband region and an exemplary frequency hopping pattern 1150 for the UL narrowband region in accordance with aspects of the present disclosure. Such a frequency hopping pattern may be employed by eNB 110a having UEs 120a (eg, UE1) and 120c (eg, UE2) in FIG. 1, for example. In the exemplary frequency hopping pattern 1100, the BS organizes eight narrowband regions from the DL system bandwidth. At time t, UE1 and UE2 are assigned the two highest DL narrowband regions as shown. Then, at time t+k, UE1 and UE2 are assigned the next two lower DL narrowband regions. UE1 and UE2 are each assigned a lower DL narrowband region at times t+2k and t+3k, respectively, as shown. On the other hand, different exemplary frequency hopping patterns 1150 may be employed for the UL narrow band region. At time t, UE1 and UE2 are assigned two lowest UL narrowband regions. At time t+k, UE1 and UE2 are assigned two intermediate UL narrowband regions. At time t+2k, UE1 and UE2 are assigned the lowest UL narrow band region and the highest UL narrow band region, and at time t+3k, UE1 and UE2 are assigned the two highest UL narrow band regions. Other frequency hopping patterns for DL and UL narrowband regions are possible and within the scope of this disclosure.

[00110] In accordance with aspects of this disclosure, transmission resources (eg, resource elements or resource blocks) may be reserved for other uses when system bandwidth is organized into narrowband regions. For example, transmission resources at the edge of UL system bandwidth may be reserved for legacy (eg, Rel-9) UEs to transmit Physical Uplink Control Channel (PUCCH) signals, and MTC UEs may reserve reserved resources. You may not be allowed to use it. Resources may be reserved by excluding reserved resources when organizing system bandwidth into narrowband regions. Additionally or alternatively, the system bandwidth may be organized into a narrowband region containing reserved resources, and then a UE utilizing the narrowband region containing reserved resources may indicate that the reserved resources should not be used. Can be notified.

[00111] FIG. 12 illustrates two example techniques 1200 and 1250 for reserving transmission resources when organizing system bandwidth into narrowband regions, according to aspects of this disclosure. In technique 1200, reserved portions 1202, 1204 of UL system bandwidth (eg, reserved for PUCCH transmission) are excluded from being organized into narrowband regions and non-reserved portion 1206 of UL system bandwidth is narrowed. Band areas 1210, 1212, 1214, 1216, 1218, 1220 are organized. As shown, this may remove some of the non-reserved system bandwidth from the narrow band region. In technique 1250, UL system bandwidth is divided into narrowband regions 1252, 1254, 1256, 1258, 1260, 1262, 1264, 1266 without excluding reserved portions 1272, 1274. In a cell using technique 1250, the cell may be assigned to a UE (eg, MTC UE) assigned to use narrowband region 1252 and/or narrowband region 1266 (eg, resource element, resource block, symbol, etc.). The reserved transmission resources (in the granularity of) should not be used by the UE.

[00112] FIG. 13 illustrates example operations 1300 for wireless communication that may be performed by a BS (eg, eNode B 110a in FIG. 1) according to aspects of this disclosure. Act 1300 may be performed by the BS to support MTC UEs and may use one of the exemplary techniques for reserving transmission resources shown in FIG.

[00113] Operation 1300 begins at block 1302, where the BS determines a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions communicating with a user equipment (UE). , One or more downlink (DL) narrowband regions and one or more uplink (UL) narrowband regions. The BS may determine the DL narrow band region and the UL narrow band region by performing a scheduling algorithm, for example. For example, and with reference to FIG. 12, a BS determines a DL narrowband region (not shown) from the DL system bandwidth to communicate with a UE (eg, UE 120a in FIG. 1), 10 MHz or 50 MHz. UL narrowband region 1252 may be determined from the UL system bandwidth of the RB.

[00114] Operation 1300 continues at block 1304, where the BS is unavailable to the UE in at least one of one or more DL narrowband regions or one or more UL narrowband regions. Identifies a set of resources. Continuing with the above example with reference to FIG. 12, the BS identifies that RBs 0 and 1 of UL narrowband region 1252 are not available to the UE because they are included in the reserved portion 1272. To do.

[00115] At block 1306, the BS provides an indication of the identified set of resources to the UE. Continuing the above example, the BS indicates that RBs 0 and 1 in narrowband region 1252 are not available to the UE, and the PDCCH that schedules the UE to send PUSCH to BS using narrowband region 1252. To the UE.

[00116] Operation 1300 continues at block 1308, where the BS communicates with the UE using the narrowband region. Continuing the above example, the BS receives the PUSCH occupying the RBs 2-5 of the narrowband region 1252 from the UE.

[00117] FIG. 14 illustrates example operations 1400 for wireless communication that may be performed by a UE (eg, UE 120a in FIG. 1) according to aspects of this disclosure. Act 1400 may be performed by an MTC UE served by a cell using one of the exemplary techniques for reserving transmission resources, eg, shown in FIG. Act 1400 may complement act 1300.

[00118] Operation 1400 begins at block 1402, where the UE determines a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions communicating with a base station (BS). , One or more downlink (DL) narrowband regions and one or more uplink (UL) narrowband regions. The UE may determine the DL narrow band region and the UL narrow band region, for example, by decoding the control channel from the BS. Continuing with the above example, and referring to FIG. 12, the UE determines a DL narrowband region (not shown) from the DL system bandwidth to communicate with the BS (eg, eNB 110a in FIG. 1). The UL narrowband region 1252 may be determined from the UL system bandwidth of 10 MHz or 50 RBs.

[00119] Operation 1400 continues at block 1404, where the UE is utilized by the UE in at least one of one or more DL narrowband regions or one or more UL narrowband regions from the BS. Receives an indication of a set of impossible resources. Continuing the above example with reference to FIG. 12, the UE indicates from the BS that RBs 0 and 1 of UL narrowband region 1252 are not available to the UE and uses narrowband region 1252 to BS. Receive a PDCCH that schedules the UE to send the PUSCH.

[00120] At block 1406, the UE identifies a set of resources based on the received indication. Continuing the above example, the UE identifies that RBs 0 and 1 in narrowband region 1252 are unavailable to the UE.

[00121] Operation 1400 continues at block 1408, where the UE communicates with the BS using the narrowband region. Continuing the above example, the UE sends the PUSCH occupying the RBs 2-5 of the narrowband region 1252 to the BS.

[00122] A cell serving MTC UEs and non-MTC UEs may allocate some transmission resources for sounding reference signal (SRS) transmissions. However, while the current (eg, Rel-12) SRS may be transmitted on a group of 4 consecutive resource blocks, the narrowband regions organized in the system bandwidth each contain 6 consecutive resource blocks. Can be a group. According to aspects of the disclosure, a cell serving MTC UEs and non-MTC UEs multiplexes Sounding Reference Signal (SRS) resources for MTC UEs and non-MTC UEs in a code division multiplexing (CDM) manner. obtain. As an example, SRSs may be transmitted on resources allocated from system bandwidth in such a manner that each SRS is within the narrow band region.

[00123] According to aspects of the present disclosure, MTC SRS locations in a narrowband region may be assigned, taking into account narrowband region locations within the system bandwidth and cell-specific SRS bandwidths and locations. Considering narrowband region location within the system bandwidth and cell-specific SRS bandwidth and location while assigning a location for the SRS to the MTC UE is that the MTC UE is orthogonal to the SRS transmitted by the legacy UE. It may be possible to send the SRS (which is differentiable by the code in the SRS, for example). The SRS in the narrow band may be aligned with the cell SRS boundary rather than with the start of the narrow band region. For example, in a 50 RB wide system bandwidth with 8 narrow band areas and a 40 RB wide cell-specific SRS bandwidth centered on the system bandwidth, the SRS to be transmitted by the MTC UE is 4 RBs in the bandwidth. In that case, the SRS location in each NB may be no SRS in NB1 and NB8, an SRS on RB2-5 of NB2, NB4, and NB6, and an SRS on RB0-3 of NB3, NB5, and NB7.

[00124] FIG. 15 illustrates a transmission for MTC SRS in a UL system bandwidth that is organized into narrowband regions, eg, as described above with reference to FIGS. 7-8 and 11-12. 1 illustrates an exemplary technique 1500 for resource allocation. In the exemplary technique, the cell serving BS organizes the 50 RB wide UL system bandwidth 1560 in the cell into eight narrowband regions 1502, 1504, 1506, 1508, 1510, 1512, 1514, 1516. The BS also determines that the UE served by the cell (eg, based on network standard or system operator configuration) should send the SRS in a 40 RB wide SRS bandwidth 1570 centrally located in the system bandwidth. doing. The BS is configured to transmit the SRS by the MTC UEs assigned to use one of those narrowband regions by narrowing the narrowband regions 1504, 1508, and 1512 of each RB2-5 (6RB narrowband region). Bottom 4 RBs). The BS may also use RBs 0-3 (6RB narrowbands) of each of the narrowband areas 1506, 1510, and 1514 for transmission of the SRS by the MTC UE assigned to use one of those narrowband areas. Allocate the 4 RBs above the region). The BS does not allocate RB for transmission of SRS in narrowband regions 1502 and 1516.

[00125] According to an aspect of the present disclosure, a BS is a portion of an SRS bandwidth (for example, a 40 RB width SRS bandwidth in FIG. 15) that a UE using a narrow band region is not allocated for transmission of a 4 RB width SRS. It may be indicated that a 2RB wide SRS in 1520, 1522, 1524, 1526, 1528, 1530, 1532, 1534 should also be transmitted. The 2 RB wide SRS may be transmitted by the UE using narrowband region 1502 or 1516 and 1504-1514. The 2RB wide SRS may not be orthogonal to the legacy 4RB wide SRS, but the lack of orthogonality may be irrelevant in some situations (eg, when a non-MTC UE is not transmitting the SRS).

[00126] FIG. 16 illustrates example operations 1600 for wireless communication that may be performed by a BS (eg, eNode B 110a in FIG. 1) according to aspects of this disclosure. Act 1600 may be performed by the BS to support MTC UEs and may use one of the example techniques for allocating transmission resources for MTC SRSs shown in FIG.

[00127] Operation 1600 begins at block 1602, where the BS determines a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions communicating with a user equipment (UE). , One or more downlink (DL) narrowband regions and one or more uplink (UL) narrowband regions. The BS may determine the DL narrow band region and the UL narrow band region by performing a scheduling algorithm, for example. For example, and with reference to FIG. 15, a BS determines a DL narrowband region (not shown) from the DL system bandwidth to communicate with a UE (eg, UE 120a in FIG. 1), 10 MHz or 50 UL narrowband region 1504 may be determined from the UL system bandwidth 1560 of the RB.

[00128] Operation 1600 continues at block 1604 where the BS allocates resources for transmission of a sounding reference signal (SRS) by the UE in at least one of the one or more UL narrowband regions. decide. Continuing with the above example with reference to FIG. 15, the BS determines that RBs 2-5 of UL narrowband region 1504 are for the transmission of SRS by the UE.

[00129] At block 1606, the BS communicates with the UE using at least one of the one or more narrowband regions, wherein communicating receives the SRS on the determined resources. Be prepared to do so. Continuing with the above example, the BS receives a transmission from the UE in the narrowband region 1504 including the SRS in RBs 2-5 of the narrowband region 1504.

[00130] FIG. 17 illustrates example operations 1700 for wireless communication that may be performed by a UE (eg, UE 120a in FIG. 1) according to aspects of this disclosure. Act 1700 may be performed, for example, by an MTC UE being served by a cell using one of the example techniques for allocating transmission resources for MTC SRS shown in FIG. Act 1700 can complement act 1600.

[00131] Operation 1700 begins at block 1702, where the UE determines a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions communicating with a base station (BS). , One or more downlink (DL) narrowband regions and one or more uplink (UL) narrowband regions. The UE may determine the DL narrow band region and the UL narrow band region, for example, by decoding the control channel from the BS. Continuing with the above example, and referring to FIG. 15, the UE determines a DL narrowband region (not shown) from the DL system bandwidth to communicate with the BS (eg, eNB 110a in FIG. 1). The UL narrowband region 1504 may be determined from the UL system bandwidth 1560 of 10 MHz or 50 RBs.

[00132] Operation 1700 continues at block 1704, where the UE determines resources for transmission of a sounding reference signal (SRS) in at least one of the one or more UL narrowband regions. .. Continuing the above example with reference to FIG. 15, the UE determines that RBs 2-5 of UL narrowband region 1504 are for transmission of SRS.

[00133] At block 1706, the UE communicates with the BS using at least one of the one or more narrowband regions, wherein communicating transmits the SRS on the determined resources. Be prepared to do so. Continuing the above example, the UE sends a transmission that includes the SRS in RBs 2-5 of narrowband region 1504.

[00134] As used herein, the phrase referring to "at least one of" a list of items refers to any combination of those items, including the single members. By way of example, "at least one of a, b, or c" is meant to include a, b, c, ab, ac, bc, and abc.

[00135] The steps of the methods or algorithms described in connection with the disclosure herein may be implemented directly in hardware, in software modules executed by a processor, or in a combination of the two. .. Software is to be broadly construed to mean instructions, data, code, or any combination thereof, regardless of name such as software, firmware, middleware, code, microcode, hardware description language, machine language. The software module is RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, PCM (phase change memory), register, hard disk, removable disk, CD-ROM, or known in the art. It may reside in any other form of storage medium. An exemplary storage medium is coupled to the processor such that the processor can read information from, and/or write information to, the storage medium. Alternatively, the storage medium may be integral to the processor. The processor and storage media may reside in an ASIC. The ASIC may reside in the user terminal. Alternatively, the processor and storage medium may reside as separate components in the user terminal. Generally, where there are operations shown in the figures, those operations may have corresponding counterpart means-plus-function components with similar numbers.

[00136] For example, the means for determining may be one or more processors, such as the receive processor 258, controller/processor 280, transmit processor 264, and/or other processors and modules of the UE 120 shown in FIG. Can be included. Means for receiving or communicating may include the receive processor (eg, receive processor 258) and/or antenna(s) 252 of UE 120 shown in FIG. Means for transmitting or communicating may comprise the transmit processor (eg, transmit processor 220) and/or antenna(s) 234 of eNB 110 shown in FIG. Means for indicating may include one or more processors, such as the transmitting processor 220, controller/processor 240, and/or other processors and modules of the eNB 110 shown in FIG.

[00137] In one or more exemplary designs, the functions described may be implemented in hardware, software, or a combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer readable media may be a RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage device, or a desired program in the form of instructions or data structures. It may comprise any other medium that may be used to carry or store the code means and may be accessed by a general purpose or special purpose computer, or a general purpose or special purpose processor. Also, any connection is properly termed a computer-readable medium. For example, software can transmit from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave. Where applicable, coaxial cables, fiber optic cables, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. As used herein, discs and discs include compact discs (CDs), laser discs (discs), optical discs, and digital versatile discs (discs). DVD), floppy disk and Blu-ray disk, where the disk typically magnetically reproduces data and is a disc. Optically reproduces the data with a laser. Combinations of the above should also be included within the scope of computer-readable media.

[00138] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of this disclosure. Therefore, the present disclosure should not be limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.
The inventions described in the claims at the initial application of the present application will be additionally described below.
[C1] A method for wireless communication by a user equipment (UE), comprising:
Determining a set of DL narrowband regions partitioned from downlink (DL) system bandwidth;
Determining a set of UL narrowband regions partitioned from the uplink (UL) system bandwidth;
Determining a mapping between the set of DL narrowband regions and the set of UL narrowband regions;
Communicating with a base station (BS) using at least one of the DL narrowband region or the UL narrowband region included in the mapping;
Comprising a method.
[C2] The system of C1, wherein the set of DL narrowband regions and the set of UL narrowband regions are partitioned based at least in part on a minimum of the DL system bandwidth and the UL system bandwidth. Method.
[C3] The method according to C1, wherein the DL system bandwidth is different from the UL system bandwidth.
[C4] The determined set of DL narrowband regions comprises a first number of DL narrowband regions, and the determined set of UL narrowband regions comprises a second number of UL narrowband regions, wherein The method of C3, wherein the first number is different from the second number.
[C5] the determined set of DL narrowband regions comprises a first number of DL narrowband regions, and the determined set of UL narrowband regions comprises a second number of UL narrowband regions, wherein In C3, the method according to C3, wherein the first number is the same as the second number.
[C6] The mapping is
Mapping at least one single UL narrowband region to multiple DL narrowband regions, or
Mapping at least one single DL narrow band region to multiple UL narrow band regions
The method according to C1, comprising at least one of:
[C7] The mapping is common to multiple UEs,
The method further comprises receiving the mapping indication in one of a broadcast message or a message dedicated to the UE.
The method according to C6.
[C8] The mapping is UE-specific,
The method further comprises receiving the mapping indication in a message to the UE.
The method according to C1.
[C9] determining a first frequency hopping pattern for the DL narrowband region;
Determining a second frequency hopping pattern for the UL narrowband region;
The method according to C1, further comprising:
[C10] A method for wireless communication by a user equipment (UE), comprising:
Determining a plurality of narrowband regions partitioned from the system bandwidth, the plurality of narrowband regions being one or more downlink (DL) narrowband regions for communicating with a base station (BS). One or more uplink (UL) narrowband regions,
Determining resources for transmission of a sounding reference signal (SRS) within at least one of the one or more UL narrowband regions;
Communicating with the BS using the narrowband region, wherein the communicating comprises transmitting the SRS on the determined resource,
Comprising a method.
[C11] The method of C10, wherein the location of resources in the UL narrowband region for the transmission of SRS by the UE is based on the location of the UL narrowband region in the system bandwidth.
[C12] The method of C11, wherein the location of resources in the UL narrowband region is also based on cell-specific SRS bandwidth.
[C13] The determination of resources for transmission of SRS is
Determining a first location of resources for transmission of an SRS for a first set of one or more UL narrowband regions;
Determining a second location of resources for transmission of the SRS for a second set of one or more UL narrowband regions;
The method according to C11, comprising:
[C14] The method of C11, comprising the determining of resources for transmission of SRS comprises determining no resources for transmission of SRS in one or more of the UL narrowband regions.
[C15] A method for wireless communication by a base station (BS), comprising:
Determining a set of DL narrowband regions partitioned from downlink (DL) system bandwidth;
Determining a set of UL narrowband regions partitioned from the uplink (UL) system bandwidth;
Determining a mapping between the set of DL narrowband regions and the set of UL narrowband regions;
Communicating with at least a user equipment (UE) using at least one of the DL narrowband region or the UL narrowband region included in the mapping;
Comprising a method.
[C16] The method of C15, wherein the set of DL narrowband regions and the set of UL narrowband regions are partitioned based at least in part on a minimum of the DL system bandwidth and the UL system bandwidth. Method.
[C17] The method of C15, wherein the DL system bandwidth is different from the UL system bandwidth.
[C18] wherein the determined set of DL narrowband regions comprises a first number of DL narrowband regions and the determined set of UL narrowband regions comprises a second number of UL narrowband regions, wherein The method of C17, wherein the first number is different from the second number.
[C19] the determined set of DL narrowband regions comprises a first number of DL narrowband regions, and the determined set of UL narrowband regions comprises a second number of UL narrowband regions, wherein In C17, the method according to C17, wherein the first number is the same as the second number.
[C20] The mapping is
Mapping at least one single UL narrowband region to multiple DL narrowband regions, or
Mapping at least one single DL narrow band region to multiple UL narrow band regions
The method according to C15, comprising at least one of:
[C21] The mapping is common to multiple UEs,
The method further comprises providing an indication of the mapping in one of a broadcast message or a message dedicated to each UE,
The method according to C20.
[C22] The mapping is UE-specific,
The method further comprises providing an indication of the mapping in a message to the UE,
The method according to C15.
[C23] determining a first frequency hopping pattern for the DL narrowband region;
Determining a second frequency hopping pattern for the UL narrowband region;
The method according to C15, further comprising:
[C24] A method for wireless communication by a base station (BS), comprising:
Determining a plurality of narrowband regions separated from the system bandwidth, the plurality of narrowband regions being one or more downlink (DL) narrowband regions for communicating with a user equipment (UE). One or more uplink (UL) narrow band regions,
Determining resources for transmission of a Sounding Reference Signal (SRS) by the UE in at least one of the one or more UL narrowband regions;
Communicating with the UE using the narrowband region, wherein the communicating comprises receiving an SRS on the determined resource,
Comprising a method.
[C25] The method of C24, wherein the location of resources in the UL narrowband region for transmission of SRS by the UE is based on the location of the one or more UL narrowband regions in system bandwidth.
[C26] The method of C25, wherein the location of resources in the one or more UL narrowband regions is also based on cell-specific SRS bandwidth.
[C27] The determination of resources for transmission of SRS is
Determining a first location of resources for transmission of an SRS for a first set of one or more UL narrowband regions;
Determining a second location of resources for transmission of the SRS for a second set of one or more UL narrowband regions;
The method according to C25, comprising:
[C28] The method of C25, wherein the determining of resources for transmission of SRS comprises determining no resources for transmission of SRS in one or more of the UL narrowband regions.

Claims (15)

A method for wireless communication by a user equipment (UE), comprising:
Determining a set of DL narrowband regions partitioned from downlink (DL) system bandwidth;
Determining a set of UL narrowband regions partitioned from an uplink (UL) system bandwidth, wherein the DL system bandwidth is different from the UL system bandwidth,
Determining a mapping between the set of DL narrowband regions and the UL narrowband region;
Receiving from a base station (BS) an indication of a set of resources in a DL narrow band region in the set of DL narrow band regions or in a set of UL narrow band regions in the UL narrow band region, In, the set of resources is unavailable to the UE,
Identifying the set of resources based on the received indication;
Using other set of resources in said one UL narrowband region including the identified set of one DL narrowband region or resource that includes the identified set of resources to communicate with the BS And wherein the other set of resources excludes the identified set of resources,
Comprising a method. The method of claim 1, wherein the set of DL narrowband regions and the set of UL narrowband regions are partitioned based at least in part on a minimum of the DL system bandwidth and the UL system bandwidth. .. The determined set of DL narrowband regions comprises a first number of DL narrowband regions and the determined set of UL narrowband regions comprises a second number of UL narrowband regions, wherein the The method of claim 1, wherein a first number is different than the second number. The determined set of DL narrowband regions comprises a first number of DL narrowband regions and the determined set of UL narrowband regions comprises a second number of UL narrowband regions, wherein the The method of claim 1, wherein the first number is the same as the second number. The mapping is
At least one mapping of at least one single UL narrowband region to a plurality of DL narrowband regions, or at least one mapping of at least one single DL narrowband region to a plurality of UL narrowband regions A method according to claim 1. The mapping is common to multiple UEs,
The method further comprises receiving the mapping indication in one of a broadcast message or a message dedicated to the UE.
The method according to claim 5. A method for wireless communication by a base station (BS), comprising:
Determining a set of DL narrowband regions partitioned from downlink (DL) system bandwidth;
Determining a set of UL narrowband regions partitioned from an uplink (UL) system bandwidth, wherein the DL system bandwidth is different from the UL system bandwidth,
Determining a mapping between the set of DL narrowband regions and the UL narrowband region;
Identifying a set of resources in one DL narrowband region in the set of DL narrowband regions or one UL narrowband region in the set of UL narrowband regions, wherein the set of resources is user equipment ( UE) is not available,
Providing an indication of the identified set of resources to the UE ,
Communicating with at least the UE using the other set of resources in said one UL narrowband region including the identified set of one DL narrowband region or resource that includes the identified set of resources And wherein the other set of resources excludes the identified set of resources,
Comprising a method. 8. The method of claim 7, wherein the set of DL narrowband regions and the set of UL narrowband regions are partitioned based at least in part on a minimum of the DL system bandwidth and the UL system bandwidth. .. The determined set of DL narrowband regions comprises a first number of DL narrowband regions and the determined set of UL narrowband regions comprises a second number of UL narrowband regions, wherein the The method of claim 7, wherein a first number is different than the second number. The determined set of DL narrowband regions comprises a first number of DL narrowband regions and the determined set of UL narrowband regions comprises a second number of UL narrowband regions, wherein the The method of claim 7, wherein the first number is the same as the second number. The mapping is
At least one mapping of at least one single UL narrowband region to a plurality of DL narrowband regions, or at least one mapping of at least one single DL narrowband region to a plurality of UL narrowband regions The method according to claim 7. The mapping is common to multiple UEs,
The method further comprises providing an indication of the mapping in one of a broadcast message or a message dedicated to each UE,
The method according to claim 11. Said mapping is UE specific,
The method further comprises providing an indication of the mapping in a message to the UE,
The method according to claim 1 or claim 7. Determining a first frequency hopping pattern for the DL narrowband region;
8. The method of claim 1 or claim 7, further comprising: determining a second frequency hopping pattern for the UL narrow band region. An apparatus for wireless communication, comprising a processor configured to perform the method according to any one of claims 1-14.

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